spring mvc - Validation fails in thymeleaf form but request still goes through -

i'm new thymeleaf (and spring mvc actually), i've read docs , can't seem figure 1 out.

i have standard form:

<form id="form" th:action="@{/next/page}" action="#" th:object="${form}" method="post"> 

and inside form have input. use thymeleaf validate input on form submit. validation looks like:

th:if="${#fields.haserrors('something')}" th:errors="*{something}"> 

my controller has method following signature:

@requestmapping(value = "/next/page", method = requestmethod.post)    public string example(@valid form form, bindingresult bindingresult, httpservletrequest request, httpservletresponse response)  {      if(bindingrequest.haserrors()) {         return page-my-form-is-on;      }     ... other stuff here ...  } 

when form submitted , there's validation error, seems page still navigating /next/page specified in th:action, when loads, still same page form on validation error message shown.

how can cancel request , prevent navigating /next/page when there's validation error? when there's validation error want stay on same page , display error.